Item's generally don't have properties to boost accuracy
Weapon accuracy is tied to 2 things inherent to the item itself: Weapon proficiency bonus and magic item enhancement bonus. Since you've gtot inherent bonuses on the magic item enhancement bonus doesn't matter and since you are using implements, there is no proficiency bonus to tap into. 4e really relies on feats and stat mods to boost accuracy for your PC.
Feats: Accuracy > Damage > Defenses in 4e
You've probably started to get a feel for this as you miss on your (sure to be) damaging attacks. This is accuracy feats are always stressed before damage feats, you generally do half or no damage on a miss which can be quite a big deal. If at all possible talk with your DM about retraining some of your feats now. Those defenses feats and daul implement caster are nice, but you'll be killing the monsters much quicker if you hit (and thus also avoid damage) I would drop both improved defenses and unarmored agility (and pick them up later in heroic as you level) and instead take the implement expertise for whichever you are using (dagger implements I assume) followed up by a superior implement expertise feat (accurate). Those two feats will boost your to hit by another +2.